Mechanisms of rapid sympatric speciation by sex reversal and sexual selection in cichlid fish
Mechanisms of rapid sympatric speciation by sex reversal and sexual selection in cichlid fish
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DOI：
10.1023/a:1013379521338
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发表时间：
2001-11-01
期刊：
影响因子：
1.5
通讯作者：
van Alphen, JJM
中科院分区：
文献类型：
--
作者：
Lande, R;Seehausen, O;van Alphen, JJM
通过对性别决定基因与颜色多态相关的种群遗传模型的分析，研究了慈鱼物种形成的机制。这些模型是基于对生态、雄性和雌性交配行为以及性别决定和颜色多态的遗传的实验室实验和野外观察相结合的。这些模型解释了为什么将男性转变为女性的性逆转基因往往是X连锁的，并与新的颜色有关，使用了性染色体上的限制性重组假说，正如之前关于重组进化的理论所建议的那样。这些模型揭示了快速共域物种形成的多种途径，通过具有强烈分类交配的新颜色形态的起源，这些配对既包含性别反转基因，也包含抑制基因。尽管没有地理隔离或生态分化，但新物种暂时或无限期地与祖先物种共存。这些结果可能有助于解释不同种类的棘鱼物种的不同形态和比率，特别是岩栖单色珊瑚物种的爆炸性多样化。
Mechanisms of speciation in cichlid fish were investigated by analyzing population genetic models of sexual selection on sex-determining genes associated with color polymorphisms. The models are based on a combination of laboratory experiments and field observations on the ecology, male and female mating behavior, and inheritance of sex-determination and color polymorphisms. The models explain why sex-reversal genes that change males into females tend to be X-linked and associated with novel colors, using the hypothesis of restricted recombination on the sex chromosomes, as suggested by previous theory on the evolution of recombination. The models reveal multiple pathways for rapid sympatric speciation through the origin of novel color morphs with strong assortative mating that incorporate both sex-reversal and suppressor genes. Despite the lack of geographic isolation or ecological differentiation, the new species coexists with the ancestral species either temporarily or indefinitely. These results may help to explain different patterns and rates of speciation among groups of cichlids, in particular the explosive diversification of rock-dwelling haplochromine cichlids.